Hi all, With it being winter and hunting season coming to a close, I figured I could start up my garage project again. I have 8' ceilings currently only with 2x6 rafter ties 48" OC. My plan is to run joists to support the dry wall. But I have a couple questions. I'm going to have to sister the boards because 1. I can haul 24' boards 2. That would be a pain to get them up there. Can I run 6 joists (splitting the rafter ties) essentially putting them 24" OC? The only load will be drywall. Or do I need to run 12 joists and leave the rafter ties to do there only job?